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Hormonal Communication (HORMONAL SYSTEM (Transmission by the blood stream,…

- - - - For example blood glucose concentration
      - Can also result due to another hormone ore a nerve impulse
      - Hormones are transported in the blood plasma
        
        They then diffuse out of the blood and bind to specific receptors
        
        Found on the cell surface membrane
        
        once bound, the hormone stimulates the target cell to produce a response
- - - - Adrenalin gland
      - The pancrease
  - - - produces thyroxine which controls rate of metabolism and the rate that glucose is used up
    - - produces adrenaline which increases heart rate and breathing rate
    - - Produce growth hormones, which control the growth of bones and muscle
    - - produce testosterone which controls sperm production
  - - - produces thymosin promotes production and maturation in white blood cells
    - - Produces insulin converts excess glucose into glycogen in the liver and glucagon converts glycogen back into glucose in the liver
    - - produces melatonin affects reproductive development
    - - Produce oestrogen which controls ovulation also , oestrogen which controls ovulation progesterone prepares the uterus lining for receiving an embryo.
- - - - The receptor may be in the nucleus or the cytoplasm
      - hormone-receptor complex acts as a transcription factor which in turn facilitates or inhibits the transcription of a specific gene.
      - OESTROGEN is an example
- - - - This triggers a cascade reaction mediated by chemicals called second messengers
- - - - produces hormones that are vital to life such as cortisol and aldosterone
      - The outer region
      - includes cortisol which helps regulate metabolism
    - - produces non-essential hormones such as adrenaline which helps the body react to stress
      - The inner region
      - Adrenaline increases heart rate sending blood to the muscles and brain quickly